lovett



T. J. LOVETT.

GRINDING MILL. APPLICATION FILED APR-M1912. RENEWED JAN. 20. 1916.

Patented Aug. 15, 1916.

4 SHEETS-SHEET I- T. J. LOVETT.

GRINDING MILL. APPLICATION FILED APR. 4-. 1912. RENEWED JAN. 20, ms.

1,194,757. PatentedAug. 15,1916.

4 SHEETS-SHEET 2- T. J. LOVETT.

GRINDING MILL. APPLICATION FILED APR- 4,1912- RENEWED 1AN.20,I9I6.

1,1 94,757. Patented Aug. 15,1916.

HEET 3.

e5 6615, a? Q N iveizrr T. J. LOVETT.

GRINDING MILL. 7 APPLICATION FILED APR- 4.1912 RENEWED IIAN. 20.1915-1.,1 94,757. I Patented Aug. 15, 1916.

4 SHEETS-SHEET rinrrnn s'rarns THOMAS J. LOVETT, OF CHICAGO, ILLINOIS,

risers-non TO oorrnn raocnss COMPANY,

OF CHICAGO, ILLINOIS, A CORPORATION OF SOUTH DAKOTA.

GRINDING-MILL.

Application filed April 4, 1912, Serial No. 688,365.

To all whom it may concern:

Be it known that I, THOMAS J. Lovn'r'r, a citizen of the United States,residing at Chicago, in the county of Cook and State of Illinois, haveinvented a new and useful Improvement in Grinding-Mills, of which thefollowing is a specification.

My object is to provide a grindingmill of improved construction adaptingit for the rapid and economical reduction of ore, and other more or lessfriable material, to a fine mesh or state of division.

It is also my object to provide a mill particularly well adapted forthetreatment, by a torsional rubbing action, of or containing ductile metalin flaky condition, whereby the flakes are twisted into lumps tofacilitate their separation from the gangue, in accordance with themethod of treating ore described in Letters Patent No.97 9,180, grantedto me December 20, 1910.

In carrying out my invention, in the form herewith illustrated, Iprovide lower and up per members having flat more or less smooth andcooperating grinding-faces. The grinding-members may be plates ofchilled iron or steel and are formed preferably of removable andreplaceable sections or segments. The lower member rotates and the uppermember reciprocates, whereby material fed between them, through theupper member, is moved in the direction of the periphery of the lowermember and subjected, for a more or less prolonged period, to atorsional rubbing action under pressure which rapidly trituratessilicious constituents of the ore and rolls and twists and tends toagglomerate any flaky ductile metallic constituents.

The present invention constitutes a modification of the invention setforth and generically claimed in my application No. 731,455, filedNovember 14, 1912, for a concentratepreparing machine.

In the accompanying drawingsFigure l is plan view of a grinding-mill, oflarge size. and great capacity, constructed in accordance with myinvention; Fig. 2, a similar view with one-half the lowergrindingmembers, and the upper reciprocating grindingmember and itsframe removed; Fig. 3, a broken side elevation of the machine on asomewhat larger scale and with the surrounding collecting troughremoved; and Fig. 4, an enlarged section taken on line 4 in Fig. 1.

Specification of Letters Patent.

Patented Aug. 15, 1916.

Renewed January 20, 1916. Serial No. 73,181.

In the construction shown, the stationary parts of the machine rest uponand are secured to a foundation frame formed of I- beams 5.

The reference numeral 6 designates a central stationary bearing-sleevefor a vertical shaft 7. Secured to the upper end of the shaft is adisk-shaped grinding-member supporting-bed 8 formed on its undersidewith a bevel-gear 9 and an annular inclined bearing surface 10, andformed on its upper side with a peripheral flange or rim 11 and acentral, flanged boss or hub 12.

Mounted in bearings 18, on the foundation frame, is a shaft 14 carryinga bevelgear 15, driving the bevel-gear 9, and a large gear 16 driven bya pinion 17 on a drive-shaft 18. The shaft 18 is journaled in bearings19 on the bed frame and carries a pulley 20 to which the driving poweris applied. The lower grinding-member 21 is of disk-shape and formed ofa plurality of closely fitting segments, as illustrated in Fig. 2. Theupper surfaces of the segments are more or less smooth and each segmenthas on its under side an inner lip or flange 22, to receive the flangeof the hub 12, and an outer flange 23 fitting into the flange 11. Thegrinding-member 21 and its supporting disk or bed 8 are held againstindependent rota-- tion by a key 24. The rotating bed or disk 8 issupported upon rollers 25 journaled in bearing-frames 26 mounted on thefoundation frame 5. The rollers 25 have inclined faces conforming to theinclined bearing face 10 which rides thereon.

Secured upon the foundation frame are four standards 27 carryinginwardly extending, horizontal bearing-rollers 28 and verticalguide-rollers 29. Riding upon the roll ers 28 between the guide-rollers29 is an angle-bar frame 30 for the upper grindingmember 31. Thisgrinding-member is made up of a plurality of sections each consisting,preferably, of a metal plate formed with flanges 32 fitting within thevertical sides of the angle-bars 30 and extending over the horizontalsides thereof, as shown most plainly in Fig. 4. The sections which formthe upper grinding-member 31 may fit together in the frame or the framemay be divided into pockets adapted to receive the individual sections.In Fig. 1 these pockets and sections are shown to be five in number, thecentral one being twice the size of those at the ends. The side bars ofthe angle-bar frame 30 are tied together at op; posite ends by thecross-braces 33.

Journaled in three alincd bearings 34, on the foundation fame, is arock-shaft 35 keyed to which is a pair of upwardly eX- tending rockingarms 36, 37. The shorter arm 36 is connected through a pitma'n 38 withaneccentric 39 on the shaft 14-, and the longer arm 37 is connectedthrough a pitman l0 with the adjacent end-brace 33 of the frame 30. Theend of the pitman 38 may be adjusted up and down in a slot 36 in the arm36, by means of a screw 36 to change the throw of the arm, and partsmoved thereby, with reference to the eccentric 39. Changing the distanceof throw of the reciprocating frame is one way of varying the speed ofmovement of one grinding-member relative to the other. The centralsection of the upper grinding-member 31, as illustrated, carries ahopper ll which in practice may extend beneath the feed spout of acrushed-ore supplying bin, not shown. The hopper 41 is mounted in adownwardly flaring feed-opening 42 through said central section.

In operation power applied to the pulley 20 turns the shaft 18 andthrough the gears 17, 16, turns the shaft 14 and the gear 15 andeccentric 39 carried thereby. The engagement between the gears 15 and 9causes the bed or disk 8 and lower grinding-member 21 to be rotated atdesired speed. At the same time the eccentric 39 through the pitman 38rocks the arm 36, shaft 35 and arm 37 to reciprocate the frame 30 on thesupporting rollers 28 between the guides 29.

per member the crushed ore fed into the hopper ll is subjected underpressure to trituration from different directionssimultaneously, thedirection of movement being at approximately right angles to each other.This action aided by the movement of the ore pieces or particles againsteach other has the effect of rapidly breaking up the more friable gangucand releasing therefrom the metallic constituents, and of subjecting thelatter furthermore to a torsional rolling and twisting action whichquickly changes any ductile metal of a flaky character into lumps ofslug, pellet or analogous shape. It furthermore has the effect, to quitean extent, of agglomerating ductile metal clusters, and separateparticles, into lumps of pellet or analogous shape. The tendency of theupper and lower grinding-members is to I cause the ore as it istriturated to move of the incoming ore. If the ore as fed to the machineis mixed with water, as is usual, the latter also tends to wash the ore,as it is being ground, in the direction of the periphery of the lowergrinding-member. In the drawing, T have shown a gradually dependingcollecting trough 44 around the lower member leading to a chute 4:5 forcollecting and carrying off the ground product.

In the treatment of very hard ore which is difficult and slow to grind,the central section only of the upper grinding-member may be providedwith the downwardly flaring feed-opening 42, the other sections beingunprovided with such openings. F or grinding more friable ore each ofthe sections may be provided with, preferably, downwardly flaringfeed-openings L2 fitted with hoppers like the hopper l1, or other meansfor directing the ore thereto. The machine illustrated may thereforehave live separate and distinct feeds whenever the action of the grinding-members is suflicient to suitably treat the ore in a comparativelyshort distance of travel thereof between the members.

The machine shown and described has great capacity for the treatment ofores and particularly those of a friable nature; and the power requiredper ton of ore treated is comparatively low, for the reason that theentire area of at least the upper grindingmember isin constant grindingaction. The wear upon the grinding surfaces of the members issubstantially uniform throughout, and no furrows or ridges will appeartherein. Thus the sections of the members may be worn almost throughbefore it is necessary to renew them. The sections of the upper memberare, for convenience in lifting them out of and placing them intoposition, provided with perforated upardly extendinglugs 43. Thesections of the upper grinding-member are as to the pressure they exertindependent of each other and as they become worn weights may be placedthereon. In the treatment of certain ores it may be desirable to give tothe central section greater weight per square inch of grinding surfacethan the other sections, which may be done by placing weights thereon.Thus ore in its initial treatment may be subjected to greaterweight thanduring its after treatment, where all the ore is fed through the centralsection.

The foregoing description is intended to convey a clear understanding ofmy improvements in what I now believe to be the best form of theirembodiment, and no un due limitation should be understood there- 7 from.It is my intention to claim all that is novel in my invention, in viewof my above-entitled application.

What I claim as new and desire to secure by Letters Patent, is p p 1. Ina machine of the character set forth,

the combination of a revoluble lower grinding member having a flat uppersurface and equipped with a gear, a horizontal driveshaft equipped witha driving pinion engaging said gear, a reciprocable upper grindingmember having a flat lower surface and supported by and movable upon andacross the revoluble member, guides restraining the upper member againstturning, a rock-shaft disposed at a distance from said drive-shaft andconnected therewith and actuated thereby, and connecting means betweensaid rock-shaft and said upper grinding member.

2. In a machine of the character set forth, the combination of arevoluble lower grinding member having a flat upper surface and equippedwith a gear, a horizontal driveshaft equipped with a driving pinion,engaging said gear, a reciprocable upper grinding member having a flatlower surface and movable upon and across the revoluble member, guidesfor said upper member, a rock-shaft disposed at a distance from saiddrive-shaft, an eccentric on the drive-shaft, connecting means betweenthe eccentric and said rock-shaft, and connecting means between saidrock-shaft and said upper grinding member, the rock-shaft having one armof adjustable length, whereby the throw of the upper grinding memberwith relation to the lower grinding member may be varied.

3. In a machine of the character set forth, the combination of arevoluble lower grinding member having a flat upper surface and equippedwith a gear, a horizontal driveshaft equipped with a driving pinionengaging said gear, a reciprocable upper grinding member having a fiatlower surface and movable upon and across the revoluble member, guidesfor said upper member, a rock-shaft disposed at a distance from saiddrive-shaft, an eccentric on the drive-shaft, an actuating arm 011 therock-shaft, a connecting rod connected with the eccentric and adjustablyconnected with the said arm, a second arm on the rock-shaft, andconnections between said last-named arm and said upper grinding member.

THOMAS J. LOVETT.

In presence of L. HEISLAR, R. SCHAEFER.

Copies of this patent may be obtained for five cents each, by addressingthe Commissioner of Eatents, Washington, I). C.

